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Technetium-99m-labeled lymphocytes: a radiotoxicity study.

T Merz, J Tatum, J Hirsch

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |January 1, 1986
    PubMed
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    Technetium-99m (99mTc) radiotoxicity in human lymphocytes was assessed. Significant division delay and chromosomal damage were observed at activity concentrations above 0.580 mCi/10(7) cells, indicating potential risks in diagnostic imaging.

    Area of Science:

    • Nuclear medicine
    • Cell biology
    • Radiation oncology

    Background:

    • Radiolabeled white blood cells are crucial for clinical diagnostics.
    • Radiotoxicity of radiotracers like Indium-111 (In-111) is a concern.
    • Technetium-99m (99mTc) is a potential alternative due to perceived lower radiotoxicity.

    Purpose of the Study:

    • To investigate the radiotoxicity of bound 99mTc in human lymphocytes.
    • To quantify the effects of 99mTc on cell division and chromosomal integrity.
    • To establish safe activity concentration thresholds for 99mTc in lymphocyte studies.

    Main Methods:

    • Human lymphocytes were exposed to varying concentrations of 99mTc.
    • Cell division delay was measured as an indicator of radiotoxicity.

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  • Chromosomal aberrations were analyzed to assess DNA damage.
  • Results were compared to known radiation doses (e.g., 1 Gy of 250 keV x-ray).

    • Main Results:

    • Significant lymphocyte division delay occurred above 0.580 mCi/10(7) cells.
    • Chromosomal damage equivalent to 1 Gy of 250 keV x-ray was observed at this threshold.
    • Radiotoxicity is concentration-dependent.

    Conclusions:

    • Bound 99mTc exhibits significant radiotoxicity in human lymphocytes at specific concentrations.
    • Careful consideration of 99mTc activity levels is necessary to minimize cellular damage in diagnostic applications.
    • Further research may be needed to optimize 99mTc labeling efficiency and safety profiles.